The Craftsman model is light duty compared to the others. To use it one must have moist soil and a lot of weight on it. In hard clay or rocky dirt, you're likely to break the tines.
I've thought about buying one because my lawn is fairly small. But the yard is new (not compacted yet) and putting that much wieght (incl tractor) on my wet lawn would leaves some big tracks. I want something by the fall, though, so I might end up with one for the short run.